초록 ▼

A vapor control valve (12) and system therefor for controlling fuel tank (14) pressure and for purging hydrocarbons from a storage canister (16) comprising a single electrical coil (44) responsive to control signals, wound about a carrier or bobbin (34) including a central passage (36) and means for

A vapor control valve (12) and system therefor for controlling fuel tank (14) pressure and for purging hydrocarbons from a storage canister (16) comprising a single electrical coil (44) responsive to control signals, wound about a carrier or bobbin (34) including a central passage (36) and means for dividing said central passage into first (40) and second (42) axially aligned portions; a first piston (60) slidably received within said central passage at said first portion (40); a second piston (80) slidably received within said central passage at said first portion (42); a first valve seat (132) for receiving said first piston; a second valve seat (106) for receiving said second piston, a first spring (66) for biasing said first piston into said first valve seat; a second spring (90) for biasing said second piston into said second valve seat, wherein the spring constant of said first spring is less than the spring constant of said second spring.

대표청구항 ▼

A hydrocarbon recovery and pressure control system comprising: a valve adapted to communicate between a source of hydrocarbons, a hydrocarbon storage unit and a source of vacuum pressure, said valve responsive to and adapted to receive control signals and said valve comprising: first passage means f

A hydrocarbon recovery and pressure control system comprising: a valve adapted to communicate between a source of hydrocarbons, a hydrocarbon storage unit and a source of vacuum pressure, said valve responsive to and adapted to receive control signals and said valve comprising: first passage means for communicating hydrocarbons from the source thereof to the storage unit, including a first valve seat; second passage means for communicating hydrocarbons from the storage unit to the vacuum pressure source, including a second valve seat; a solenoid assembly disposed between said first passage means and said second passage means; a central member, means for separating said central member into a first chamber proximate said first valve seat and a second chamber proximate said second valve seat, a first piston slidably received in said central member at said first chamber and first means for biasing said first piston into sealing engagement upon said first valve seat, a second piston slidably received in said central member, at said second chamber and second means for biasing said second piston into sealing engagement upon said second valve seat; said first piston operable to move against the bias force generated by said first biasing means at a first value of said control signal to permit communication through said first valve seat; and said second piston operable to move against the bias force generated by said second biasing means at a second value of said control signal to permit communication through said second valve seat.